Manually add gas changes to a dive

Create a little widget that lists all the gases / tanks we know about and
allow the user to pick one of them.

Turns out that add_event only added events at the end of the list - but we
treat that list as chronologically sorted. So I fixed that little
mis-feature as well.

This does raise the question whether we need the inverse operation
(removing a gas change). And if there are other things that we should be
able to manually edit, now that we have the infrastructure for this neat
little context menu...

See #60 -- this doesn't address all of the issues mentioned there, but at
least deals with the 'headline' of the feature request...

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/dive.h b/dive.h
index b6738d171..9d359fe18 100644
--- a/dive.h
+++ b/dive.h
@@ -471,6 +471,7 @@ extern struct dive_table dive_table;
 
 extern int selected_dive;
 #define current_dive (get_dive(selected_dive))
+#define current_dc (get_dive_dc(current_dive, dc_number))
 
 static inline struct dive *get_gps_location(int nr, struct dive_table *table)
 {
@@ -486,6 +487,16 @@ static inline struct dive *get_dive(int nr)
 	return dive_table.dives[nr];
 }
 
+static inline struct divecomputer *get_dive_dc(struct dive *dive, int nr)
+{
+	struct divecomputer *dc = NULL;
+	if (nr >= 0)
+		dc = &dive->dc;
+	while (nr-- > 0)
+		dc = dc->next;
+	return dc;
+}
+
 /*
  * Iterate over each dive, with the first parameter being the index
  * iterator variable, and the second one being the dive one.
@@ -670,6 +681,7 @@ void add_duration_to_nth_dp(struct diveplan *diveplan, int idx, int duration, gb
 void add_depth_to_nth_dp(struct diveplan *diveplan, int idx, int depth);
 void add_gas_to_nth_dp(struct diveplan *diveplan, int idx, int o2, int he);
 void free_dps(struct divedatapoint *dp);
+void get_gas_string(int o2, int he, char *buf, int len);
 
 #ifdef DEBUGFILE
 extern char *debugfilename;